Speed-modifying apparatus



(No Model.) 2 Sheets-Sheet 1. 1:'. H. RICHARDS. SPEED MODIFYINGAPPARATUS'.

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F. H. RICHARDS. vSPEED MQDIPYING APPARATUS. No. 561,520. Patented June2, 1896.

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FRANCIS il. RICHARDS, OF HARTFORD, CONNECTICUT.

SPEED-MODIFYING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 561,520, dated June 2,1896.

Application filed November Z1, 1895. Serial No. 569,626. (No model.)

To all whom it may concern:

Be it known that I, FRANCIS H. RICHARDS, a citizen of the United States,residing at Hartford, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inSpeed-Modifying Apparatus, of which the following is a specification.

My invention relates to speed modifying or governing apparatus, theobject being to provide a thoroughly-efficient apparatus of thischaracter which is readily applicable to various forms of machines andmechanisms where a modification or variation in speed at successive orpredetermined points in the operation thereof is an essential.

In the drawings accompanying and forming part of this application,Figure l is a central transverse section, taken in line 2 2, Fig. 2, ofa speed modifying' or governing apparatus embodying the presentimprovements and illustrating in full lines a part of the main or powerroll of a machine operatively connected with the apparatus, and showingalso the positions assumed by the operative parts of the apparatus whenthe machine controlled thereby is running at its maximum speed. Fig. 2is a front elevation of the apparatus with the face or frontplateremoved and with portions broken away to more clearly illustrate theoperative parts thereof. Fig. 31's an elevation, partly in section, ofaportion of the apparatus, showing the positions assumed by theoperative parts thereof when the speed of the machine controlled therebyhas been slackened or reduced. Fig. 4 is a View similar to Fig. 3,illustrating the positions occupied by the operative parts of theapparatus when the machine controlled thereby has been stopped. Figs. 5and 6 are detail views illustrating a valve casing or cylinder formoneform of fluid-regulating valve.

ing part of. the apparatus illustrated by Fig. l.- Figs. 7 and S aredetail views illustrating Fig. i) is a front elevation, partly insection, illustrating one modification of the invention. Fig. l0 is afront elevation thereof. Fig. ll illustrates in plan the valve operating or actuating mechanism shown by the modification, Figs. fl and l0.Figs. l2 and 13 are detail views of one modification of afluid-regulating valve, andu Fig. l-fi is an elevation of the apparatusoperatively connected with a motor or other driving `mechanism and withthe main or powerroll of a machine.

Similar characters refer to like parts in all the figures of thedrawings.

The speedmodifying apparatus herein shown and described is readilyapplicable to various forms of machines or mechanisms which require atany point or points in the operation thereof a variable speed orinovement. One instance of the practical application of my presentimprovements is disclosed in an application for patent for aweighing-machine liled simultaneously herewith. This weighing-machineembodies as an improvement thereof a variable-speed force-feeder4` powerroll of some machine for example,

the main roll of a feeder or feeding apparatus for a Weighing-machine,such as is shown by my application hereinbefore referred toor said rollM itself may constitute the feeder or feeding device.

In the application of the speed-modifying apparatus herein shown anddescribed to a feeder or feeding device of a weighing-machine it ispossible to secure by a minimum expenditure of power a progressivelydecreasing speed of the feeder movement at predetermined pointsin thedescent of the bucket, whereby a stream, at first of relatively largeand then of progressively decreasing volume, may be fed or forced fromthe supply-chute, which contains the material to be weighed, into thebucket, this variation in speed in that art workingaveryimportantresult.

The main roll M is shown supported by a hollow shaft 2, thepeculiarfunction of which will be hereinafter described, the roll Mbeing secured to said shaft 2 in some suitable manner for rotativemovement therewith. The shaft 2 is illustrated carrying at the outer endor extremity thereof the speed modifying or governing apparatus, whichis IOO designated in a general way by S and which, as shown, is adaptedfor rotative movement about the hollow supporting-shaft 2.

A shell or casing is illustrated at C and is shown consisting of therear wall 3, and the annular wall it, joined thereto, and the removablefront wall or face-plate 5, these forming an interior chamber orcompartment for containing the operative parts and controlling devicesof the speed-modifying apparatus.

The apparatus embodies two operativelyconnected members andvariablepressure means acting against one of said members. In the formshown these driven and driving members consist of a pair ofclosely-meshing pinions (5 and 7, which are supported for rotativemovement within the shell or casing 3 of the apparatus, thefirst-mentioned pinion constituting the driven pinion and the other thedriving-pinion, and the driven pinion 0 will be carried bythesupporting-shaft 2, being ixedly secured thereto in some wellknownmanner, as by keying.

The driving-pinion 7 has a revoluble movement about the fixed pinionGand is shown loosely supported within the shell or casing C. Thisdriving-pinion tends normally to move or rotate; but this tendency willbe limited or prevented by the application of' pressure actingthereagainst, making the driving-pinion 7, so long as this pressurecontinues, a fixed pinion, whereby it will be et'- fective for impartingmotion to its mate. lf the pressure against this pinion 7 be rcmoved orreduced, the latter will have a slipping or slackening movement,followed, naturally, bya reduction in speed of the machine or apparatuswith which the speed-modifyin g apparatus is connected.

The shell or casing C is illustrated carrying the band Wheel or pulleyS, which is shown (see Fig. 14) operatively connected with some suitableform of motor or driving mechanism, a belt 9 being illustrated as passedaround said pulley 8 and also around the power or drive wheel l0 of themotor. (Not shown.) The direction of rotation of the pulley S, and hencethe casing or shell C, which contains the operative and controllingparts of the apparatus, is indicated by the arrow (t, Fig. 2.

The speed-modifying apparatus embodies also two communicatingcompartments or chambers, one a pressure chamber or compartment and theother a storage chamber or compartment. A pressure being created in thepressure-compartment and the driving member or pinion 7 being in aposition to have this pressure exerted thereagainst, this pressure willettectually hold said member 7 against rotative movement, whereby itwill be efl'ective as a power-transmitting factor. For securing thispressure some suitable fluid will be employed-for example, ordinarylubricating-oil, with which very satisfactory results have beenobtained.

` The interior chamber or compartment of the casing C is shownsubdivided by the bifurcated partition or wall l2, between the branchesl2 and l2 of which the two pinions 6 and 7 will be rotative. Thispartition or wall l2 is shown separating the inner compartlnent of thecasing or shell C into two separate and communicating fluid compartmentsor chambers, which constitute, respectively, a pressure-compartment forcontaining fluid under pressure and a storage-compartment, thepressure-compartment being` designated by X and the storage-compartmentby X'.

As hereinbefore stated, the two pinions 6 and 7 are supported forrotative movement within the casing C, and the first-mentioned or drivenpulley has been described as fixedly secured to the hollowsupporting-shaft 2 for rotative movement therewith. There are shownformed in the rear wall 3 and the face or front plate 5 of the casingcylindrical sockets or openings for the reception and rotation thereinof the shaft or pin 7 of the driving-pinion 7, the pinion being securedto its shaft in some well-known manner, or these may be integrallyformed.

The driving-pinion 7 will have a revoluble rotative ineffective movementor period, and an alternating revoluble non-rotative eiiective movementor period, during which latter movement or period the driving-pinion 7will be effective as a power-transmitting factor for imparting movementto the pinion G and through this to the shaft 2 and the roll M, carriedby said shaft.

The direction of rotation of the speed-inedifying apparatus is indicatedby the arrow a, Fig. 2. Let it be assumed that the apparatus is rotatingin this direction and that there is no pressure acting against thepinion 7. On the rotation of the apparatus the drivingpinion 7 will berevolved about the driven pinion 6, and the resistance offered by thelatter to will have the effect of rotating the dri ving-pinion in adirection coinciding with that of the apparatus and about its own axis,and hence naturally the pinion 7 will be ineffective to transmitmovement to its mate G.

On the introduction of a fluid under pressure in thepressure-compartment X the pressure of such fluid acting against theteeth of the pinion 7 on the revolution of the same about the axis ofthe driven pinion G will e'tl'ectually limit and hold the pinion 7against rotative movement, whereby the latter, when so held, will beeffective to rotate the pinion 6 and through this the shaft 2 and theroll M. By. reducing the pressure in the pressurecompartment the pinion7 will have a slipping or freer movement, the natural result being areduction in rotative speed of the pinion 6, and hence the shaft 2 andthe roll M supported thereby. As the pressure in thepressure-compartment is progressively decreased aprogressively-decreasin g speed or reduction in movement of the pinion 6naturally follows,due to the progressively-decreasin g pressure actingagainst said pinion 7.

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As hereinbefore stated, the apparatus embodies communicating pressureand storage compartments, and for securing the requisite pressure asuitable fluid, as ordinary lubricating-oil, with which verysatisfactory results have been secured, will be employed. The fluidutilized will be maintained in circuit form. Starting at thecommencement of the operation of the apparatus from the pressurecompartment X it will flow therefrom and into the communicatingstorage-compartment X',

thereby gradually reducing the pressure inV the first-mentionedcompartment, followed by a gradual reduction in speed of the drivenapparatus, and correspondingly increasing the pressure in thestorage-compartment until the pressure in the two compartments isequalized or balanced, at which time the pinion 7 will be free to rotateabout its axis, and during the revolution thereof about the pinion 6Will bc ineffective as a power-transmitting factor, the result being astoppage of the machine.

For securing a restoration of the pressure in the pressure-compartmentto its maximum capacityor limit the rotary movements of the pinion '7will be utilized to pump or suck the fluid back from thestorage-compartment to be discharged into the pressure-compartment X ina manner to be hereinafter described, whereby the maximum pressure inthe former may be secured. A

It will be remembered that the inner chamber or compartment of the shellor casing C has been described as separated or subdivided by abifurcated partition v12,bet\veen the branches 12' and 12" of which thetwo pinions 6 and 7 are shown supported for rotative and the latter forrevoluble movement about the former.

To guard against the accidental escape or leakage of the fluid employedin any other than the desired manner, the inner faces of the branches12' and 12" are shown as having complementary curvedfaces, the curvethereof being defined by an arc struck from the axes or centers ofmovement of the two pinions 6 and 7, and the teeth thereof will have arubbing contact With said curved faces.

The partition or Wall12 is illustrated as having a straight portion 13,in which there is shown formed a port or opening 13', Which affords acommunication between the pressure and storage compartments X and X',and through which port or opening the fluid may flow or leak from thepressure into the storagescompartment, thereby reducing the pressure inthe first-mentioned compartment or chamber and correspondinglyincreasing` that in the latter.

As a means for controlling and regulating the flow of the fluid from thepressure to the storage compartment a suitable valve will be employed,the movements of which valve may be controlled by some suitable memberor part of the machine or mechanism to which the Speed-modifyingapparatus may be applied.

There is shown (see Figs. 1, 2, and 3) located Within the apparatus andformed in the straight portion 13 of the` partition 12 a cylindricalsocket 14E, and there is also illustrated tightly seated therein (seeFigs. 5 and G) a valve cylinder or chamber 15, which is shown providedwith ports 15' and 15", formed in the wall at diametrically oppositesides thereof, which communicate with the port 13' and with thecompartments X and f.

The ports 15' and 15, which constitute, respectively, induction andeduction ports, are shown tapered for a purpose to be hereinafterdescribed, and the fluid will flow from the pressure-compartment X intothe port 13', thence through the induction-port 15',throu gh thecylinder, and through the eduction-port 15", and again through the port13' into the storage-compartment X'.

A reciprocative slide-valve is shown at 16, and this valve is operativein the cylinder or casing 15, and Will have opening and closingmovements for opening and closing the ports 15' and 15" to either permitor to prevent the leakage or flow of the fluid from pressurecompartmentX to the storage-compartment X' of the apparatus.

The valve 16 is shown as reciprocative within the cylinder 15 and ashaving a reduced portion 16', about which the fluid employed will flowin passing from the pressure-compartment to the storage-compartment.

The face-plate 5 is shown having an opening 5', through which passes thevalve-stem 16 of the reciprocative valve 16, a stuffing box 17 beingprovided to prevent the escape or leakage of the fluid at this point.

The fluid, it Will be remembered, has been described as maintained incircuit form. The pressure thereof in the pressure-compartment X, actingagainst the teeth of the movable pinion 7, limits the movementthereof,\vhe1e by it will be effective to impart movement to the pinion6, and through this to the shaft 2 and roll M. The fluid flows from thepressure to the storage compartment, this flow decreasing the pressurein the former, followedby a corresponding reduction in rotative speed ofthe pinions 6 and 7, and hence of the speed of the driven apparatus.

The tapered ports in the valve-cylinder l5 are preferably employed, aswhen the valve is first opened a stream of very small volume will flowfrom the pressure to the storage compartments, which gradually increasesin volume as the valve 16 is pushed inwardly or opened farther.

It will be assumed that the pressure in the compartments X and X' isequal and that the pinion 7 is rotating in the direction of the arrow b,the direction of rotation of the casing C being the same; but a partialrotation of t-he pinion 7 is necessary to so decrease the pressure inthe storage-compartment as to leave this pressureless when the pinion 7has made said partial rotation, this causing a restoration in pressureto its normal capacity in IIO the pressure-compartment X, so that on thecontinued rotation of the pulley the checking or braking influence ofthe pressure of the fluid will be restored.

The branches 12 and 12 of the partition 12 are each shown provided witha port, that in the branch 12/ being designated by 1S and that in thebranch 12l being designated by '18', these communicating with each otherand with the two compartments X and X. The branch 12 is shown having aport or opening, and the iiuid may liow through this port, and actingagainst the teeth of said pinion the pressure of such fluid effectuallyand positively holds said pinion against rotative movement. On therotation of the pinion 7 in the direction indicated when the pressure inthe two compartments is equal the teeth of said pinion will each take upor suck from the storage-compartment X a small quantity of the iiuid,which will be carried therewith on its rotation and be dischargedthrough the port 1S in the branch 12/ into the pressurecompartment X,thereby increasing the pressure in the latter as the fluid is thusdischarged from the rotating pinion into the pressure-compartment 5 buta partial rotation of the pinion 7 is necessaryT to restore the pressurein the pressure-compartment X to its normal or maximum capacity. Thevalve 1G, it being of course understood, is closed during this peculiarpumping action of the pinion for creating to its normal capacity orlimit the pressure in the pressure-compartment X.

It will be remembered that the iiow of the tluid from thepressure-compartment X has been described as controlled by areciprocative slide-valve which has opening and closing movements, toeither permit or to prevent the iiow o'l the fluid from thepressure-compartment X into the storage-compartm ent X. The valve 1G isshownV as a balanced slidevalve, whereby but a minimum expenditure ofpower will be necessary to insure the positive operation of the same.The body of the valve 1G is shown interiorly bored to permit the liowthrough said bores of a small quantity of Fluid.

The valve-cylinder 15 is shown provided with a port 19, whichcommunicates with the storage-compartment X; and it will be apparentthat the iluid may flow through said port 19 and into the valve-cylinder15 and thence through the valve-bores to the opposite side of the valve7so that there will be maintained, throughout the operation of the valveat each end of the valve, a body of iluid, each of which counterbalancesthe other, and which insures apositive and steady movement of the valveduring its opening and closing movements.

As a means for operating the Huid-regulating-valve 1G the latter will beoperatively connected with some movable part of the machine or mechanismto which the apparatus may be applied. The face-plate 5 of the casing Cis shown provided with a projecting support 20, which is shownsupporting a slidable member 21, which is-illustrated operativelyconnected with the reciprocative valve 1G,and is also to be connectedwith some operative part of the apparatus or machine with which thespeed-modifying apparatus may be connected. The slidable member 21,which has a sliding movement on the support 20, is shown having anupwardly-projecting arm 21', illustrated as formed integral therewith,this arm being also illustrated as connected with the valve-stein 16 ofthe valve 1G. Then this slidable member 21 is pushed inwardly, it willbe apparent that the valve 16 will be thereby opened to permit the lowof a stream of fluid through the ports 15 and 15" from thepressure-compartment X into the storage-compartment X, this flow of thefluid from the pressure-compartment X to the storage-compartment Xreducing the pressure of the iiuid acting against the pinion 7, therebypermitting a relatively free or slipping movement of the pinion 7, andhence a corresponding reduction in speed of the roll M. As the iiuidl'lows from the pressure-compartment X into the storage-compartment Xthrough the tapered ports 15 and 15H the pressure in the former isgradually decreased and that in the latter gradually increased, due tothe opening movement of the valve, until the pressure in the twocompartments is equal or balances, at which time the pinion 7 will beagain free to rotate and will be thereby ineiifective as apower-transmitting medium, this peculiar relation continuing so long asthe ivalve is in its open position.

On the closure of the valve 1G the fluid will be prevented from lowinginto the storagecompartment X from the pressure-compartment X, so thaton the rotation of the pulley the pinion 7 will have a revolublemovement about the pinion 6 and a rotative movement about its own axis,during which rotative movement of the pinion it will be effective topump or suck the fluid from the storage-compartment X to be dischargedinto the pressure-compartment X until this has resumed its normalcapacity or efiiciency, at' which time said pressure, acting against thepinion 7 and iiowing through the port 1S, will cheek or prevent therotative movement of the pinion 7, and hence the latter will beeli'ective as a power-transmitting factor for transmitting movement tothe pinion 6 and through this to the roll M.

As before stated, the slidable member 21, which has been described asoperatively connected with the valve 1G, will also be opera-- tivelyconnected with some movable part of the machine or mechanism to whichthe apparatus may be applied. The slidable member 21 is shown providedwith a peripheral groove or channel 22, in which are shown seated theconnected straps 23 and 24 or other suitable device for non-rotativemovement therewith. A bifurcated actuating-lever is IOO IOS

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shown at 25, and will be pivoted, as at to some fixed part of themachine or mechanism. The support 2O is illustrated as provided with astop 20" in the form of a disk, which is shown secured by means of ascrew 20"' to the outer end of the shaft 2, and is adapted for limitingthe outward movement of the member 21. The back plate 3 of the shell orcasing C is also illustrated provided with an outwardly-projectingportion 3', and the outer end of this is shown provided with astuffing-box 2G for preventing the accidental escape of fluid therefromat this point.

Means communicating with the pressurecompartment X are provided forkeeping the same constantly supplied with fluid, so that if from anycause the fluid should accidentally escape or leak fiuid sufficient tocompensate for the leakage or loss may be supplied, so that the pressurein the pressurecompartment will be maintained at its proper efficiencythroughout the entire operation of the apparatus.

It will be remembered that for supporting the roll M and thespeed-modifying apparatus S a hollow shaft has been described. The innerend of the shaftis shown provided with a stuffing-box 27, which is shownhaving an opening 27 therein, through which is passed the bent tube orpipe 28, which carries, at the opposite end thereof, the fluid reservoiror cup 28, communicating with the pressurecompartment. The pipe 28 is ofrelatively small bore, so that the fluid will be supplied to theapparatus S under practically no pressure, and thereby not interferewith the accurate working of the apparatus. Tlie fiuid reservoir or cup2S is also shown provided with a removable screw-threaded cap or cover2S, which may be removed at will for filling the reservoir or cup 28'with the fluid employed.

The shaft 2 at a point adjacent to the apparatus S is shown providedwith a seriesl of openings 2 coincident with an annular channel ordepression 29, shown formed in the rear Wall of the apparatus, andcommuni eating with which annular channel is the port 2f ,Which alsocommunicates with the storagecompartment X. It will be apparent thenthat the oil flowing from the fiuid reservoir or cup 2S Will flowthrough the hollow shaft 2 and into the storage-compartment X, fromwhich it may b'c drawn or sucked by the pinion 7 on its rotation in themanner previously described, the oil being discharged into thepressure-compartment X.

In Figs. 9 to 14, inclusive, is illustrated one modification of theapparatus, a different form of valve being illustrated for regulatingthe flow of iiuid from the pressure-compartment.

The face-plate 5 is shown provided with a proj ect-in g portion 30, inwhich, as illustrated, is formed a 'curved or tortuous conduit orpassage SO, communicating with the compartments X and X', through whichthe iiuid flows from the pressure to the storage compartment for thepurpose of reducing the pressurein the former and hence correspondin glydecreasing the rotative movement of the roll M through the freeing ofthe pinion 7.

There is shown transversely intersecting the conduit 30 the valve seator socket 3l, and the conduit or passage adjacent the valve seat orsocket 3l is shown reduced.

The fluid-regulating valve is illustrated at 32 as a plug-valve and ashaving at diametrically opposite sides in its Wall the tapered openings32 and 32", which permit, as the valve 32 is opened or turned in itsseat, the flow of a gradually-increasing stream from the pressure to thestorage compartments of the apparatus.

The valve-stem 33 is shown passing through a stuffing-box 34, whichlatter is provided to guard against accidental escape or leakage of thefluid employed. The valve-stem 33 illustrated provided at its upper endwith an actuating-arm 33, which is shown operativel y connected with theslidable member 2l, and hence through the latter With some operative ormoving part of the machine or mechanism to which my apparatus may beapplied for controlling the movements of said valve, and henceregulating the flow of the fluid from the pressure to the storagecompartments thereof.

The slidable member 2l is shown provided with the inwardly-projectingarm 21, having an enlarged portion, in Which, as illustrated, is formedthe longitudinal slot 2l, through which is passed thedownwardly-projecting portion 33 of the actuating-arm 253/. It will beapparent that when said slidable member 2l is slid inwardly the arm 33will be revolved or turned, and hence the valve will be opened to permitthe passage of the fluid from the pressure to the storage compartment,and it will be evident that When said member 2l is moved in the oppositedirection the arm 33 will be oppositely revolved or turned and the valveclosed to prevent the flow of fluid from the pressure to the storagecompartment, whereby on the rotation of the pinion 7 the fluid may besucked from the storage-compartment to again create a pressure in thepressure-compartment, so that on the continued rotation of the apparatusS and the revolution of the pinion 7 about its mate G the latter will bepositively held against rotative movement by the pressure of fluidthereagainst and will be effective as a powertransmitting factor.

Having thus described my' invention, I claiml. The combination with acasing comprising two compartments separated by a partition havingports, of two gears rotativelysupported between said compartments; avalvechamber in said partition having a tapered port or portscommunicating with said compartments; and a valve operative in saidchamber.

2. The combination with a casing comprising two compartments separatedby a parti- IOC) IIO

tion having ports, of two gears rotativ ely supported between saidcompartments; fluidsupply means communicating with one of saidcompartments; a valve-chamber in said pai tition having a port betweensaid compartments, and having also a second port communicatin g withsaid fluid-supply means; and a longitudinally-bored valve operative insaid chamber.

3. The combination with a casing having two compartments therein, of avalve-chamber with ports; a valve; a pair of gears rotatively supportedbetween said compartments; a hollow shaft for supporting one of saidgears and communicating with one of said compartments; and afluid-reservoir connected to said shaft.

4. The combination with a casing having a bifurcated partition withports for separating the same into two compartments, said partition alsohaving a socket and a port; of a cylindrical valve-chamber seated insaid socket and having diametrically opposite ports in its wallcommunicatin g with the port in said partition; two gears rotativelysupported between the said compartments; and a bored valve operative insaid chamber and having a portion of its body of reduced diameter.

5. The combination with a casing separated into two compartments by abifurcated partition, each of the branches of which is provided with aport; of a valve for controlling the supply of iiuid and a pair of gearsrotatively supported between the branches of said partition.

G. The combination with a casing separated into two compartments by abifureated partition provided with a valve-chamber having a tapered portor ports, 'each of the branches of said partition also having a port; ofa pair of gears rotatively supported between the branches of saidpartition; and a valve operative in said chamber.

7. The combination with a casing separated into two compartments by abifurcated pai# tition provided with a valve-chamber having a taperedport or ports communicating with said compartments, and having also aport in each of its branches; of a valve for controlling the supply offluid; a pair of gears rotatively supported between said branches; ahollow shaft for supporting one of said gears and communicating with oneof said compartments; and a fluid reservoir conneeted to said hollowshaft.

8. In an apparatus of the class specified, the

combination with a casingfembodyin g a pressure-compartir] ent and acommunicating storage-compartment; of a pair of meshing pinions locatedwithin said casing, and constituting, respectively, a driven'pinion anda driving-pinion, the pressure of the fluid in the Huid-compartmentgoverning the rotation of said driving-pinion, and the flow of the fluidin the pressure-compartment into the communicating storage-compartmentreducing the pressure against said drivin g-pinion; a valve-chamberhaving a tapered port; and a valve located within said chamber, andhaving an opening movement to permit the iiow of a stream ofgradually-increasing volume from the pressurescompartment into thestorage-compartment.

9. ln an apparatus of the class specified, the combination with acasing, embodying a pressure-compartment for containing fluid underpressure; of a pair of meshing pinions located within said casing, andconstituting, respectively, a driven pinion and a driving-pinion; ahollow shaft supporting said driven pinion and communicating with thepressure-compartment; and a fluid-reservoir com mu nicating with saidhollow shaft.

10. In an apparatus of the class specified, the combination with acasing, having a bifurcated partition separating said easing into twocompartments constituting, respectively,

a pressure-compartment and a storage-compartm ent; a port in saidpartition, and a valve for said port for controlling the flow of fluidfrom the pressure-compartir] ent into the storage-compartment; and asecond port in said compartment for the return-flow of the fluid; and apair of meshing pinions located in said casing.

ll. In an apparatus of the class specified, the combination with acasing, embodying communicating pressure and storage compartments; of apair of meshing pinions operative in said casing; a bifurcated partitionseparating the two compartments, and having the inner faces of thebranches of said partition defined by an arc struck from the centers ofmovement of said pinions, the teeth of said pinions having rubbingcontact with said curved faces, and a valve for controlling the supplyof fluid from the pressure-compartment to the storage-compartment.

FRANCIS H. RICHARDS.

Witnesses:

FRED. J. DOLE, E. C. WHITNEY.

IOC

